Electric cut-out.



T. E..MURRAY.

AELECTRIC) GUTOUT.

APPLICATION FILED DB0. 26, 191s.

Patented July 21, 1914.

THoMAs'E. MURRAY, or NEW YORK, N. Y.

ELECTRIC CUT-OUT.

Specification of Letters Patent.

Patented July 21, 1914.

Application tiled December 26, 1913. Serial No. 808,?76.

To all whom/tt may concern:

Be it known that I, .THOMAS E. MURRAY,

a citizen of the United States, residing at signed forthreewire-systems, and consists in the constructioi'i hereinafter setforth,

l whereby the plug for closing circuit between the terminals of theneutral lead is locked in position by the fuse plugs closing circuitrespectively between the terminals of the positive and negative leads,so that said neutral plug cannot be removed from the base unlessl t-hefuse plugs are rstl taken out.

In the accompanying drawings-Figure 1 is a plan view of my cut-out,showing the neutral and positive plugs-removed. Fig.

2 is a section on the line 2, 2 of Fig. 1. Fig. 3 is a section on theline 3, 3 of Fig. 1. Fig. 4 is a top view'of the neutral fuse plug.

Similar letters of reference indicate like parts.

A.V is the base, preferably of insulating refractory material,- such asporcelain, and

having two sockets C, D, in each of which. is a metal contact clip E, F.To the clips E, F are connected the terminals of the posi tive lead of athree-wire system, preferably in the manner shown at G, Fig. 1. Twosimilar, sockets H, I (H not shown). are provided, with similar clips J,to which are connected the terminals of the negativelead of said system.Between the sockets E, F and H, I is a channel K, in which are contactclips L, M, to which, are attached the terminals of the neutral lead, asshown in Fig. ,3. Between'the clips L, M. is a movable barrier N ofinsulating material.

The fuse plugs O, P which connect the terminals of the positive andnegative leads are of well known form. Each has a body portion Q, ofporcelain arched on its upper side and provided on its lower side withpro-.

jections It,

lwith the clips'J in said sockets, thus closing the fuse and betweenthe-U circuit through.

terminals of the positive lead. When the fuse plug P is inserted in thesockets C, I), the contact plates S coperate with the clips E, F in saidsockets, thus closing circuit through thel fuse and between theterminals of t-he negative lead.

The neutral plug U has an elongated projectio'n V on its lower side, to,which is secured a metal plate W having two` downwardly turned wingportions X which cooperate with the clipsL, M in channel K. Then plug -Uis in place, as shown in Fig. 3, circuit is established through plate Wbetween the terminals of the neutral lead.

In order to prevent the removal of the neutral plug U from the basebefore the fuse plugs O, P are removed, I form on each side of plug Ulateral project-ions, a, Fig. 4, which are received in recesses b initheup-l per surface of said base. 'I also provide on each sidevof each fuseplug a lateral projection c. The neutral plug U being put in place, theprojections a cn said plug are received in and fill the recesses b. Thefuse plugs O, P then being inserted, their projections c lap over theprojections b of plug U, and t-hus prevent the removal of `said plugs Uuntil after plugs O, P have been taken out.

I claim:

1. An electric cut-out, comprising a base having sockets and circuitterminals of the positive and negative leads of a-threewire systemtherein, fuse' plugs entering said sockets and coperating with saidterminals to close circuit in each lead, neutral terminals disposed in achannel in said4 base, a plug entering said channel, a bridge bar onsaid plugcoperating with said terminals to close circuit in said neutrallead,

-and means on said positive and negative fuse plugs for engaging saidneutral plug after the same has been seated in said base and preventingthe removal of said neutral pluguntil said positive and negative-plugsshall first have been removed.

2. An electric cut-out, comprising a base having sockets and circuitterminals of the positive and negative leads of la three-wire systemtherein, fuse plugs entering said sockets and coperating with saidterminals to close circuit ip each lead, neutral termi-v, nals disposedin a channel in said base.; a plug entering said channel, a bridge baron said pfug' coperating with said termil l nals to close circuit insaid neutral lead, In testirlnony whereof I havealxed my A lateralprojections on said plug adapted to signature 1nA presence of twoWitnesses. enter recesses inythe upper surface of said base, and lateralprojections on said posi- THOMAS E' MURRAY' 5 tive and negative fuseplugs extending over l llitnesses:

said neutral plug projections when said GERTRUDE T. -PORTER5 plugs areseated in fsaid base. MAY T. MCGARRY.

Copies o! this patent may he obtained for v cents each, by addressingthe Commissioner `of Patents.

Washington, I). C.

